diff --git a/src/nix/deployment/mod.rs b/src/nix/deployment/mod.rs
index 7b19dca..2ba4d63 100644
--- a/src/nix/deployment/mod.rs
+++ b/src/nix/deployment/mod.rs
@@ -370,6 +370,9 @@ impl Deployment {
         for (name, profile_drv) in profile_drvs.iter() {
             let mut target = chunk.remove(name).unwrap();
 
+            // TODO: look if target's system type support build on target.
+            // hard fail if the build on target.
+
             if let Some(force_build_on_target) = self.options.force_build_on_target {
                 target.config.set_build_on_target(force_build_on_target);
             }
@@ -439,6 +442,9 @@ impl Deployment {
                 return Err(ColmenaError::Unsupported);
             }
 
+            // TODO: add to check if there's support to upload keys.
+            // If not, warn about it but do nothing.
+
             let host = target.host.as_mut().unwrap();
             host.set_job(Some(job));
             host.upload_keys(&target.config.keys, true).await?;
@@ -621,6 +627,8 @@ impl Deployment {
             let host = target.host.as_mut().unwrap();
             host.set_job(Some(job.clone()));
 
+            // TODO: certain system types does not have a concept of profile.
+            // generalize the profile algorithm
             if !target.config.replace_unknown_profiles {
                 job.message("Checking remote profile...".to_string())?;